Plug connector

A plug connector (1) for releasably connecting a first fluid line (2a) to a second fluid line (2b) by means of a insertion sleeve (3), wherein the plug connector (1) has an inner sleeve (4) with an open first axial inner sleeve end (4a) and an opposite open second axial inner sleeve end (4b), wherein a connecting portion (V) for connecting the inner sleeve (4) to the first fluid line (2a) is provided in the area of the first axial inner sleeve end (4a), wherein the second axial inner sleeve end (4b) encloses a receiving space (AR) into which an open first axial insertion sleeve end (3a) of the insertion sleeve (3) can be inserted axially, wherein an opposite open second axial insertion sleeve end (3b) of the insertion sleeve (3) can be connected to the second fluid line (2b), wherein the plug connector (1) has a locking mechanism for positive locking of the insertion sleeve (3) to the inner sleeve (4), wherein the locking mechanism comprises a locking recess (11) and a locking element (12), wherein the locking recess (11) connects an outer circumferential surface (AU4) of the inner sleeve (4) to the receiving space (AR), wherein, when the insertion sleeve (3) is in a defined coupling position in the receiving space (AR) of the inner sleeve (4), the locking element (12) within the locking recess (11) can be moved between an arresting position (SS) in which an arresting portion (12c) of the locking element (12) is in engagement with an engagement opening (13) arranged on the insertion sleeve (3), and a disengaged position (FS) in which the arresting portion (12c) is not in engagement with the engagement opening (13), wherein the plug connector (1) has a displacement sleeve (5) which is located outside the inner sleeve (4) in the radial direction and which can be displaced in the axial direction along the inner sleeve (4) between a parked position (PP), in which the locking mechanism is deactivated and a locking position (VP) in which the locking mechanism is activated, wherein the locking mechanism comprises a triggering spring (6) with an actuating portion (7) and a retaining portion (8), the triggering spring (6) being pretensioned in a retaining position (HP) in the parked position (PP) of the displacement sleeve (5), in which the retaining portion (8) is engaged on a retaining protrusion (9) of the inner sleeve (4), wherein the actuating portion (7) in the retaining position (HP) projects inwards in the radial direction into the receiving space (AR) of the inner sleeve (4) through an actuating opening (10) provided on the inner sleeve (4), wherein the actuating opening (10) is arranged between the locking recess (11) and the first axial inner sleeve end (4b) when viewed in the axial direction of the inner sleeve (4), wherein the actuating portion (7) of the triggering spring (6) can be displaced out of the receiving space (AR) in the radial direction by the insertion sleeve (3) when the insertion sleeve (3) is inserted into the receiving space (AR) of the inner sleeve (4), whereby the retaining portion (8) of the triggering spring (6) can be disengaged from the retaining protrusion (9) of the inner sleeve (4) and a triggering force (FA) directed in the direction of the second axial inner sleeve end (4b) acts on the displacement sleeve (5) from the triggering spring (6), by means of which the displacement sleeve (5) can be displaced from the parked position (PP) into the locking position (VP) and wherein a first guiding device (14) for guiding the locking element (12) is provided on the displacement sleeve (5), which is configured in such a way that when the displacement sleeve (5) is moved from the parked position (PP) into the locking position (VP), a first guiding force (FF1) acts on the locking element (12), by means of which the locking element (12) can be displaced from the disengaged position (FS) into the arresting position (SS).